Truecaller Fixes Flaw That Could Let Attackers Use Malicious Links to Harvest IP Addresses, Other User Data


Truecaller has mounted a flaw that could let attackers to use the service’s API to put a destructive hyperlink as the URL for their profile image. The destructive hyperlink could be&#xA0used to fetch IP addresses of other Truecaller people and complete assaults this sort of as brute-drive and dispersed denial of company (DDoS), based mostly on the acquired&#xA0information. Even further, the flaw could possibly allow the attackers to harvest IP addresses of people and scan for open up ports. To exploit the flaw and assault a Truecaller consumer, a destructive social gathering just experienced to entice a consumer to an contaminated profile. Truecaller informed Gizmos 360 that it has mounted the flaw and unveiled its designs to start a bounty programme to reward protection scientists in the foreseeable future.

The flaw existed in a single of the APIs of Truecaller that permitted attackers to put their destructive hyperlinks as the URL for a profile image. Bengaluru-based mostly protection researcher Ehraz Ahmed found out the Truecaller flaw and confirmed a evidence-of-idea (PoC) to Gizmos 360.

Attackers leveraging the flaw could fetch the IP addresses of people and silently attain their area as properly as unit specifics. Mainly because it was an API flaw, it could be accessed as a result of all variations of Truecaller, like Android, iOS, and the Internet.

As soon as IP deal with and other consumer info have been acquired as a result of the flaw, an attacker could determine area specifics to monitor people viewing their profiles. The vulnerability could also be exploited to scan for open up ports just after accessing IP addresses to complete brute-drive and DDoS assaults.

“Each time a consumer sights the attacker’s profile on Truecaller — both by undertaking a research or tapping the pop-up from a simply call, the custom made script receives executed and user’s IP deal with receives recorded,” clarifies Ahmed, incorporating that the consumer would not recognize any change as the profile URL is not shown publicly.

To reproduce the flaw, Ahmed produced the PoC displaying the procedure of recording IP addresses of people in a log file. The custom made PHP script utilized by the protection researcher labored with each IPv4 and IPv6 based mostly IP addresses. Gizmos 360 was also equipped to validate the scope of the vulnerability by screening it as a result of various Android and Apple iphone designs. The custom made script was equipped to attain IP addresses of the equipment together with highlighting their product figures and software package variations.

In scenario if a consumer is hunting for a Truecaller profile from a desktop, the flaw could permit an attacker know about browser specifics. To showcase the extent of the flaw current in Truecaller, Ahmed has created a movie and published a scenario analyze.

“It was not too long ago introduced to our consideration that there was a little bug in our application products and services which permitted the modification of one’s very own profile in an unintended way,” Truecaller reported in a assertion to Gizmos 360. “We thank the protection researcher for bringing this to our recognize and collaborating with us. The bug was right away mounted.”

Truecaller also unveiled that it is established to start a bug bounty programme to reward protection scientists reporting flaws in its process in the foreseeable future.

“We, at Truecaller, are humbled to welcome all contributions from the protection study local community. We have partnered with a local community of scientists and will soon announce a bounty software in which we, as a clear and liable organisation, will also reward scientists for their contributions,” the organization mentioned.

As of September this 12 months, Truecaller has over 150 million daily active users globally. The Truecaller application also before this 12 months crossed the mark of 500 million downloads and surpassed the milestone of one million Premium subscribers throughout the world.

Truecaller is mostly well-liked for its caller ID and simply call blocking functions. However, the application does provide Voice-about-World-wide-web-Protocol (VoIP) based mostly voice contacting help and UPI-driven payments company to counter WhatsApp. Truecaller in April also tied up with Bengaluru-headquartered RedBus to begin providing bus ticket reserving company to its people in India.

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